Update compose dependencies to include symfony/process v5.0.8

The symfony/process v5.0.8 release contains a fix for the annoying
input/output error messages on PHP 7.4.

Example:
fread(): read of 8192 bytes failed with errno=5 Input/output error

See: symfony/symfony#36380

Package operations: 0 installs, 7 updates, 0 removals
  - Updating symfony/polyfill-php73 (v1.15.0 => v1.16.0)
  - Updating symfony/polyfill-mbstring (v1.15.0 => v1.16.0)
  - Updating symfony/console (v5.0.7 => v5.0.8)
  - Updating symfony/process (v5.0.7 => v5.0.8)
  - Updating symfony/polyfill-ctype (v1.15.0 => v1.16.0)
  - Updating symfony/yaml (v5.0.7 => v5.0.8)
  - Updating phpdocumentor/reflection-common (2.0.0 => 2.1.0)